; ------------------------------ FIRE.ASM ------------------------------
; Bye Jare of VangeliSTeam. Want more comments? Write'em. O:-)


        .MODEL SMALL
        .STACK 400
        DOSSEG
        LOCALS

        .DATA

FirePal LABEL BYTE
;  Fire palette, colors 0-63 ------------

        DB        0,   0,   0,   0,   1,   1,   0,   4,   5,   0,   7,   9
	DB	  0,   8,  11,   0,   9,  12,  15,   6,   8,  25,   4,   4
	DB	 33,   3,   3,  40,   2,   2,  48,   2,   2,  55,   1,   1
	DB	 63,   0,   0,  63,   0,   0,  63,   3,   0,  63,   7,   0
	DB	 63,  10,   0,  63,  13,   0,  63,  16,   0,  63,  20,   0
	DB	 63,  23,   0,  63,  26,   0,  63,  29,   0,  63,  33,   0
	DB	 63,  36,   0,  63,  39,   0,  63,  39,   0,  63,  40,   0
	DB	 63,  40,   0,  63,  41,   0,  63,  42,   0,  63,  42,   0
	DB	 63,  43,   0,  63,  44,   0,  63,  44,   0,  63,  45,   0
	DB	 63,  45,   0,  63,  46,   0,  63,  47,   0,  63,  47,   0
	DB	 63,  48,   0,  63,  49,   0,  63,  49,   0,  63,  50,   0
	DB	 63,  51,   0,  63,  51,   0,  63,  52,   0,  63,  53,   0
	DB	 63,  53,   0,  63,  54,   0,  63,  55,   0,  63,  55,   0
	DB	 63,  56,   0,  63,  57,   0,  63,  57,   0,  63,  58,   0
	DB	 63,  58,   0,  63,  59,   0,  63,  60,   0,  63,  60,   0
	DB	 63,  61,   0,  63,  62,   0,  63,  62,   0,  63,  63,   0


ByeMsg  DB 'FIRE was coded bye Jare of VangeliSTeam, 9-10/5/93', 13, 10
        DB 'Sayonara', 13, 10, 10
        DB 'ELYSIUM music composed by Jester of Sanity (an Amiga demo group, I think)', 13, 10
        DB 'The music system you''ve just been listening is the VangeliSTracker 1.2b', 13, 10
        DB 'VangeliSTracker is Freeware (no money required), and distributed in source code', 13, 10
        DB 'If you haven''t got your copy of the VangeliSTracker, please go to your', 13, 10
        DB 'nearest BBS and get it NOW', 13, 10
        DB 'Also, don''t forget that YOU can join the VangeliSTeam. Contact the', 13, 10
        DB 'VangeliSTeam in the following addresses: ', 13, 10, 10
        DB '  Mail:     VangeliSTeam                          ³ This demo is dedicated to', 13, 10
        DB '            Juan Carlos Ar‚valo Baeza             ³        Mark J. Cox', 13, 10
        DB '            Apdo. de Correos 156.405              ³            and', 13, 10
        DB '            28080 - Madrid (Spain)                ³      Michael Abrash', 13, 10
        DB '  Internet: jarevalo@moises.ls.fi.upm.es          ³ At last, the PC showed good', 13, 10
        DB '  Fidonet:  2:341/27.16, 2:341/15.16, 2:341/9.21  ³ for something.', 13, 10, 10
        DB 'Greetings to all demo groups and MOD dudes around.', 13, 10
        DB '$'


        UDATASEG

Imagen  DB 80*50 DUP (?)
Imagen2 DB 80*50 DUP (?)

        .CODE
        .STARTUP

        CLD
        MOV     AX,13h
        INT     10h
        CLI
        MOV     DX,3c4h
        MOV     AX,604h                 ; "Unchain my heart". And my VGA...
        OUT     DX,AX
        MOV     AX,0F02h                ; All planes
        OUT     DX,AX

        MOV     DX,3D4h
        MOV     AX,14h                  ; Disable dword mode
        OUT     DX,AX
        MOV     AX,0E317h               ; Enable byte mode.
        OUT     DX,AX
        MOV     AL,9
        OUT     DX,AL
        INC     DX
        IN      AL,DX
        AND     AL,0E0h                 ; Duplicate each scan 8 times.
        ADD     AL,7
        OUT     DX,AL

        MOV     DX,3c8h                 ; Setup palette.
        XOR     AL,AL
        OUT     DX,AL
        INC     DX
        MOV     CX,64*3
        MOV     SI,OFFSET FirePal       ; Prestored...
@@pl1:
         LODSB
         OUT    DX,AL
         LOOP   @@pl1
        MOV     AL,63
        MOV     CX,192*3                ; And white heat.
@@pl2:
         OUT    DX,AL
         LOOP   @@pl2
        STI

        MOV     AX,DS
        MOV     ES,AX
        MOV     DI,OFFSET Imagen        ; Cleanup both Images.
        MOV     CX,80*50
        XOR     AX,AX
        REP STOSW

MainLoop:
        MOV     DX,3DAh                 ; Retrace sync.
@@vs1:
        IN      AL,DX
        TEST    AL,8
        JZ      @@vs1
@@vs2:
        IN      AL,DX
        TEST    AL,8
        JNZ     @@vs2

        PUSH    DS
        POP     ES
        MOV     SI,81+OFFSET Imagen     ; Funny things start here. 8-P
        MOV     DI,81+OFFSET Imagen2
        MOV     CX,48*80-2
        XOR     BH,BH
@@lp:
        XOR     AX,AX
        ADD     AL,-1[SI]
        ADC     AH,BH
        ADD     AL,-80[SI]
        ADC     AH,BH
        ADD     AL,-79[SI]
        ADC     AH,BH
        ADD     AL,-81[SI]
        ADC     AH,BH
        ADD     AL,1[SI]
        ADC     AH,BH
        ADD     AL,80[SI]
        ADC     AH,BH
        ADD     AL,79[SI]
        ADC     AH,BH
        ADD     AL,81[SI]
        ADC     AH,BH
        ROR     AX,1
        ROR     AX,1
        ROR     AX,1
        TEST    AH,60h                  ; Wanna know why 60h? Me too.
        JNZ     @@nx                    ; This is pure experience.
         CMP    DI,46*80+OFFSET Imagen2 ; And this was a bug.
         JNC    @@dec                   ; This one's by my cat.
          OR    AL,AL                   ; My dog coded here too.
          JZ    @@nx                    ; I helped my sister with this one.
@@dec:
           DEC  AL                      ; Yeah! Cool a bit, please.
@@nx:
        INC     SI
        STOSB
        LOOP    @@lp                    ; New image stored in Imagen2.

        MOV     SI,80+OFFSET Imagen2    ; Scrolling copy. :-)
        MOV     DI,OFFSET Imagen
        MOV     CX,40*48
        REP     MOVSW

        MOV     SI,80*43+OFFSET Imagen2 ; Get rid of some ashes.
        MOV     CX,6*80
        MOV     AH,22
@@rcl:
         MOV    AL,[SI]
         CMP    AL,15
         JNC    @@rcn
          SUB   AL,AH
          NEG   AL
          MOV   [SI],AL
@@rcn:
         INC    SI
         LOOP   @@rcl

        MOV     SI,80+OFFSET Imagen2    ; And show it.
        MOV     DI,0
        MOV     AX,0A000h
        MOV     ES,AX
        MOV     CX,40*48
        REP     MOVSW

        MOV     AH,1
        INT     16h
        JNZ     Bye
        JMP     MainLoop
Bye:
        XOR     AH,AH
        INT     16h
        MOV     AX,3
        INT     10h
        MOV     DX,OFFSET ByeMsg
        MOV     AH,9
        INT     21h
        MOV     AX,4C00h
        INT     21h

        END
; ------------------------------ End of FIRE.ASM ---------------------------